Originally Posted by 11.4

FF,

To replace the bearings:

Use two 8 mm allen keys to remove one of the end-caps (you have to use one on each end, but of course only one comes off unless you're extraordinarily lucky). Then put the allen bolt back in about half way on the side you removed the end-cap from and use a soft mallet (or piece of 2x4) to gently tap the axle out the other side. It'll come out with one bearing attached. Then clamp the middle of the axle in a vise (gently -- it's aluminum) (or use a vise grips if you don't have a vise) and remove the remaining end-cap. The attached bearing should pull off; if not, let the axle suspend between a couple pieces of 2x4 (or a vise), resting on the bearing; put the allen bolt part way into that end of the axle and tap lightly. It will pop the axle through, leaving the bearing behind.